Those Battery switches do not look as though they are Marine approved!
I would check those out very carefully before using that boat!
I would suspect any and everything done be previous owner/owners, including that wire that has crimp on splices!
1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
1976 16ft. Tahiti 2.5 IO (sold)